Electro-Voice DL15W Datasheet

Electro-Voice DL15W Datasheet
Electro:Voice® ~.
DL15W
Low-Frequency
Reproducer
• Subwoofer in mUlti-way systems
• Compact independent subwoofer
• Extended linear excursion for low
distortion
• TIRTM and FOOTM reduce distortion,
keep voice coil cool, and smooth
frequency response
• 400 watts long-term power capacity
• 97-dB sensitivity
• Thermally efficient magnet assembly for high reliability
• PROTEFTM coating helps protect
woofer from excessive power peaks
SPECIFICATIONS
Usable Axial Frequency Response in Typical
Enclosure (4.0 ft3 tuned to 40 Hz), Swept OneThird-Octave Pink Noise, 4 Volts at 10 Feet,
Anechoic Environment, Normalized for 1
Wattl1 Meter (see Figure 1):'
40-2,800 Hz
Power Handling (see Power-Handling
Test section),
Per ANSVEIA RS-426-A 1980:
400 watts
Per AES2-1984/ANSI S4.26-1984,
50-500 Hz: 400 watts
100-1,000 Hz: 500 watts
Sensitivity (SPL at 1 m, 1 watt input power,
nominal impedance),
200- to 2,000-Hz Average:
99 dB
100- to 800-Hz Average:
97 dB
Impedance Response (see Figure 4 for
response in typical enclosure; see Figure 3
for response in standard baffle),
Minimum (Zmln):
6.3 ohms at 180 Hz
Nominal:
8 ohms
Distortion Response (on axis in standard
baffle, 10% rated input power; see Figure 5),
Second Harmonic,
100 Hz: -47 dB (0.4%)
1,000 Hz: -35 dB (1.8%)
Third Harmonic,
100 Hz: -47 dB (0.4%)
1,000 Hz: -40 dB (1.0%)
Beamwidth (angle included by 6-dB-down
points on polar responses for octave
bands of pink noise; see Figure 6),
500 Hz: 80 0
1,000 Hz: 80 0
2,000 Hz: 60°
1. For swept·sine·wave response in standard baffle, per
AES2-1984/ANSI S4.26-1984, see Figure 2.
Physical Constants,
Effective Piston Diameter:
330.2 mm (13.0 in.)
Moving Mass (MMo):
0.096 kg (0.212Ib)
Voice-Coil Winding Depth:
20.3 mm (0.8 in.)
Voice-Coil Diameter:
63.5 mm (2.5 in.)
Voice-Coil Winding Length:
26.9 m (88.4 ft)
Top Plate Thickness at Voice Coil:
10.9 mm (0.43 in.)
BL Factor:
22.4 tesla meter
Thiele-Small Parameters (broken in),
f.: 21 Hz
VAS: 575 liters (20.3 ft3)
aES : 0.17
MS : 4.38
TS : 0.16
RE : 6.0 ohms
710: 2.77%
So: 0.086 m2 (133 in .2)
MMO: 0.096 kg (0.212 Ib)
LE : 2.0 mH
eMS: 0.56 mmlN
R•• : 3.21 mechanical ohms
PE(max) (per ANSIIEIA RS-426-A 1980):
400 watts
Xm./: 5.6 mm (0.22 in.)
X;lm3 : 12.7 mm (0.50 in.)
V0 (So x Xmox ) : 4.82 liters (0.170 ft3)
Thermal Rise after Power Test:
85°C (185 OF)
Typical Vented Enclosures (see Typical
Enclosures section):
4.0 ft3 tuned to 35 Hz or 6.0 ft3 tuned to 30 Hz
a
a
2. Xrrwc is the one· way peak excursion which produces 10%
THO of the current waveform when driven at f,.
3. Displacement limit is the one-way peak excursion which,
when exceeded, will cause physical damage to the drive
mechanism.
Typical Amplifier Size (see Typical
Amplifier Size section):
400-800 watts
Mounting Information (see Mounting
section),
Bolt-Hole Diameter
(eight evenly spaced holes):
7.1 mm (0.28 in.)
Bolt Circle Diameter:
371 mm (14.60 in .)
Baffle Opening Diameter
(front or rear mounting):
353 mm (13.9 in.)
Electrical Connections (see Electrical
Connectors section),
Connector Type:
Push terminals for bare wires
Polarity:
A positive voltage applied to the positive
(red) terminal produces a positive
pressure at the front of the cone
Additional Descriptive Information,
Magnet Weight:
2.2 kg (4.9 Ib)
Magnet Material:
Barium ferrite
Frame:
Cast aluminum
Frame Finish:
Textured black epoxy
Plating of Steel Parts:
Bright Cadmium
Voice-Coil Material:
Aluminum
Voice-Coil Insulation:
Polyimide 220 DC rating
Voice-Coil Form:
Polyimide
Back Cover:
Black, advanced synthetic elastomer
Optional Accessories:
SMH-1 mounting hardware kit
FIGURE 10A -
.1
0
Predicted Low-Frequency
Response in a Typical
Enclosure (4.0 ft 3 tuned to 35 Hz)
0
0')
'/
·20
--NORMAL
- - - STEP DOWN
.. . - . .
- - STEP DOWN + EQ
,.
-
AtEQU£NCY It HERTZ
FIGURE 108 -
- ,- -
Predicted Low-Frequency
Response in a Typical
Enclosure (6.0 tt' tuned to 30 Hz)
0~~~~M-~~H+~1-~-HH+~~
i
.5
~/~~~r+-r~~~r+-r~~~~~
.10f,ll-+-I-ttlftt--t-1H+-I-ttlftt--t-1H+-I-ttlftt-+-l
~ ~~+11+~~~+1~~~1-+1~~~~
-2O~_~_~~N~O~RM~A~L~~~~~-r~~~~~
- - - STEP DOWN
-30. - : - . - SYE: ~N + EQ ..
FREQUENCY IN HERTZ
FIGURE 11 -
Maximum SPL at 1 Meter in
Typical Enclosure
(4.0 tt' tuned to 35 Hz)
140
.
.,
130
~120
3;
"
11 0
I
FREQUENCY IN HERTZ
Dimensions (see Figure 10),
Outer Diameter:
384 mm (1S.13 in.)
Overall Depth:
165 mm (6.48 in.)
Net Weight:
8.6 kg (19.0 Ib)
Shipping Weight:
10.2 kg (22.S Ib)
DESCRIPTION
The DL 1SW low-frequency reproducer is a
15-inch, 8-ohm driver designed for professional
high-level, hi~h-fidelity monitoring and sound
reinforcement. At the heart of this speaker is a
carefully engineered drive system. Its design
assures linear, low-distortion output, high power
capability and efficient heat transfer.
Incorporated into the design are three exclusive Electro-Voice innovations. PROTEFTM coating (U .S. patent #4,547,632), a Teflon®-based
coating, is applied to the inside diameter of the
top plate.· Occasional violent power peaks of
several seconds may expand a transducer's
voice coil into contact with the top plate, causing failure . PROTEF provides protection against
such failure. The coating lubricates any rubbing
contact and provides electrical insulation between the coil and the steel top plate. The
Thermo Inductive Ring (TIRTM) and Flux Demodulation Device (FDDTM), also included in
the DL 15W design, are aluminum castings fas4. Teflon- is a registered trademark of DuPont.
tened to the pole of the magnet. They provide a
shorted tum to control inductance and provide
a major heat transfer path from the voice coil,
which improves power handling and reduces
thf3rmal dynamic-range compression.
The voice coil itself is constructed of edgewound rectangular aluminum wire, mounted on
a rugged, laminated polyimide former. The complete assembly is low in mass and is fabricated
using the most advanced epoxies, insulations
and materials available.
Great care was taken in the selection of diaphragm materials and construction to ensure
smooth, musical upper-bass reproduction and
accurate low-frequency shock capability
(punch). The cone has a moisture-repellent
treatment, allowing it to be used in harsh and
humid conditions. (Do not expose the cone to
direct water or sunlight.)
The DL 15W is a true high-fidelity woofer in
every sense, being capable of high output, low
distortion and solid bass response.
DIRECTIONAL CHARACTERISTICS
The directional characteristics of the DL 1SW in
a 4.0-cubic-foot vented enclosure were measured in Electro-Voice's large anechoic chamber. The test signal was one-third-octave filtered pink noise centered at the frequencies
indicated. A full spherical measurement system, which is completely compatible with the
AcoustaCADDTM computer-aided design program, was used. All directional information was
measured at 20 feet. Figure 8 illustrates the
horizontal and vertical polar responses. Figure 6
shows the horizontal and vertical beamwidths.
Beamwidth is the angle at which the horizontal
and vertical polar responses have decreased in
level by 6 dB when compared to the axial
frequency response. Figure 7 illustrates the
total directivity of the DL 1SW. The directivity
factor Ro (a) is the relative value, at a point, of
the DL 1SW when compared to an ideal spherical response. The directivity index, D;, is calculated by the formula: D; = 10 log,o Ro'
TYPICAL AMPLIFIER SIZE
400-800 watts per woofer is the optimal amplifier size. Amplifiers of this size will allow maximum output with minimal risk of speaker damage when properly used. Smaller amplifiers
can also be used with excellent results-the full
capabilities of the speaker will simply not be
used.
POWER-HANDLING TEST
Electro-Voice components and systems are
manufactured to exacting standards, ensuring
they will hold up, not only through the most
rigorous of power tests, but also through continued use in arduous, real-life conditions. Two
main test specifications are used: the "AES
Recommended Practice for Specification of
Loudspeaker Components Used in Professional
Audio and Sound Reinforcement" (AES2-19841
ANSI S4.26-1984) and the "EIA Loudspeaker
Power Rating Full Range" (ANSI/EIA RS-426A 1980). Both of these specifications use noise
spectrums which mimic typical music and test
the thermal and mechanical capabilities of the
components. Electro-Voice will support relevant
additional standards as and when they become
available. Extreme, in-house powertests, which
push the performance boundaries of the components, are also performed and passed to
ensure years of trouble-free service.
Specifically, the DL 15W passes ANSI/EIA
RS-426-A 1980 with the following values:
RSR = 6.9 ohms (1.15 x RE)
PE(max) = 400 watts
Test voltage = S2.5 volts rms,
105.0 volts peak
(+6 dB)
The DL 15W passes AES2-1984/ANSI S4.261984 with the following values:
ZMIN = 6.3 ohms at 180 Hz
PE(max) = 400 watts
Test voltage = SO.2 volts rms,
100.4 volts peak
(+6 dB)
Selected decade = SO-500 Hz
RESPONSE IN STANDARD BAFFLE
AES requires a large, planar baffle for this test,
WHICH IS INTENDED TO SHOW SMOOTHNESS AND OFF-AXIS RESPONSE, NOT
BASS RESPONSE. This has proven to be
inconvenient and prohibitive, due to its size.
Here, we have chosen our lab-standard, lowdiffraction, 12-cubic-foot test enclosure, which
will demonstrate the same characteristics as
the AES standard baffle (see Figure 2). A
smoothed swept-sine-wave input is used for
this measurement to provide a more informative curve to the end user.
TYPICAL ENCLOSURES
The most extended bass, lowest distortion and
best control is usually realized in properly designed vented enclosures. In such designs, the
vent, or port, actually provides the lowest octave of output. The vent is driven to full acoustic
output by a relatively small motion ofthe speaker
cone itself, acting through the air contained
within the enclosure. The excursion of the
DL 1SW at these frequencies is much reduced
compared to sealed or open-back enclosures,
directly reducing harmonic distortion and the
possibility of speaker bottoming. See Figure
11 for maximum potential output over the frequency range. Vented-enclosure recommendations follow, some incorporating low-frequency equalization. Thiele-Small parameters
are provided so designers can tailor the response to suit their needs.
Normally Tuned Enclosures
See Figures 9A and 9B. The 6-cubic-foot enclosure is tuned to 30 Hz and has a smooth
extended response to below 40 Hz. The
4-cubic-foot enclosure "bumps up" above SO
Hz but has less extended low-bass output.
Also, Pro Sound Facts No.7, "DL Series Woofers-Plans for Recommended Vented Enclosures and Small- and Large-Signal Performance
for These Enclosures," is available from ElectroVoice at no charge . A wide variety of enclosure
sizes and degree of low-frequency extension is
described in this literature.
Step-Down Operation
The "step-down" mode approximates a B6 Thiele
alignment. Step-down extends system low-frequency response by increasing amplifier power
at certain frequencies instead of enclosure
size. In step-down, the enclosure is tuned to a
lower frequency than normal. This increases
system output in the region of the new tuning
frequency and reduces output slightly in the
region of original tuning. The smoothly falling
response which results can be equalized to
provide a new system 3-dB-down point that is
DL115W SPECIFICATION GRAPHICS
FIGURE 6 -
Axial Response in Typical Enclosure
(4.0 W), 1 WattJ1 Meter
FIGURE 1 -
Distortion in Standard Baffle at 10% Rated Input Power
130
110
,...
...,
100
120
1\
)
11 0
i/V\
17
1\
=90
.....J
U>
80
1\
....,
100
II
II
=
..J90
~ II'
..J
,
,,~
FREQUENCY IN HERTZ
80
Frequency Response in Standard Baffle
(0° and 45°)
FIGURE 2-
70
~ 1.1 J\
~,
\
'-
/1/
I
It
110
80
....,
111
100
~
=90
1\
U>
80
I
\ 1'•
If
~
Ii' \
70N
FIGURE 3 -
100
w
0
...
Beamwidth VS. Frequency
~
- ,- -
,
FREQUENCY IN HERTZ
'i~ La
~
Impedance in Standard Baffle
316
z
. . ,.
FREQUENCY IN HERTZ
,
- - O N AXIS
- - - -45° Off AXIS
i!!w
11
2nd HARMONIC--3rd HARMONIC - - -
J
.....J
c:
llrl
31.6
I I
IIII
I
I I
IIII
I
I I
IIII
I
1\
l\
I \
"-
~
10
..
3.16
i
./
,.
II
-
~
V
FREQUENCY IN HERTZ
...........
-- -
.. .. ,..
FREQUENCY IN HERTZ
Impedance in Typical Enclosure (4.0 ft3)
FIGURE 431 6
I I
IIII
I
I I
IIII
I
I I
IIII
I
FREQUENCY IN HERTZ
c:
A
w
o
~
FIGURE9-
100
31. 6
~
~
1/\
\
\
V
"'-JJ
l"- I-""
0"
..
V
V
Polar Response
./
3.1 6
FREQUENCY IN HERTZ
FIGURE 5-
Dimensions
...
16.5 em
(6.48 In.)
,...
,...
HORIZONTAL---VERTICAL --
DL115W SPECIFICATION GRAPHICS
Axial Response in Typical Enclosure
(4.0 ft3), 1 Wattl1 Meter
FIGURE1-
FIGURE 6 -
Distortion in Standard Baffle at 10"10 Rated Input Power
130
110
120
,vi
..
100
1\
I/~
J
110
~
.590
...
....I
III
80
..
II
.5
....190
§
70,. •
FREQUENCY IN HERTZ
V
II'
80
r-.
~ llJ\
\
M
70
Frequency Response in Standard Baffle
(0' and 45')
FIGURE2-
II
100
,
I /
11 0
80
..
iI1
100
I
.590
...
\ 1'.1 !
....I
III
80
jI
I
II
.
\
i-""
FIGURE 7 -
\
iD=
l200
\
- - O N AXIS
- - - - 45° OFF AXIS
70
a
100
III
0
z
i!lIII
...
31 .6
IIII
I I
I
I I
IIII
I
"
I I
J\
I \
'\.
i!
10
-
'"
~
,.....
'"
...
10
I
IIII
~
:
V
./
~
.
r\
2nd HARMONIC--31d HARMONIC - - -
,.
- - ,- -
FREQUENCY IN HERTZ
Beamwidth vs. Frequency
~~ w..
~1:
o
i!:
Impedance in Standard Baffle
316
II
m
FREQUENCY IN HERTZ
FIGURE 3 -
~II
i\
I
.. . . ,.
"
20
...
,
. ,. -
FREQUENCY IN HERTZ
,
- ,- I
-
FREQUENCY IN HERTZ
Impedance in Typical Enclosure (4.0 ft')
FIGURE 4316
I I
IIII
I
I I
IIII
I
I I
IIII
I
FREQUENCY IN HERTZ
a
FIGURE 9 -
100
III
A
Z
1\
o
...~
31.6
i!
10 '-
I
"V
\
\
./
/'"
..,.,.....
' -~
.r'
.-
,
FREQUENCY IN HERTZ
FIGURE5-
Polar Response
--
Dimensions
27'oi-H-\++-H
16.5 em
(6.48 In.)
,eer
HORIZONTAL---VERTICAL --
about 0.7 that of the original. To achieve a
similar response extension without equalization would require an enclosure at least twice
the size.
The equalization required is a second-order
underdamped high-pass filter with a Q of 2 at
the enclosure tuning frequency. This characteristic provides a boost of 6 dB at tuning and a
12-dB-per-octave roll-off below. The roll-off protects the woofer from overexcursion due to
subpassband signals (see below) . Note that
the boost does not affect system instantaneous
peak output, which is related only to the
speaker's displacement ability and effective
diaphragm area.
Pro Sound Facts No.7, noted earlier, describes
a number of step-down enclosures and the
associated peak boost frequencies for the DL
loudspeaker covered by this engineering data
sheet. The Electro-Voice XEQ-2 and XEQ-3
active crossover/equalizers offer step-down
equalization with a variety of peak-boost frequencies, appropriate for a broad range of
specific systems. XEQ-2 and XEQ-3 engineering data sheets are available from ElectroVoice.
SUBPASSBAND SPEAKER PROTECTION
Below the enclosure tuning frequency, cone
excursion increases rapidly. Since acoustic
output is also falling rapidly, there is no utility in
driving the system with signals much below
tuning frequency. While such signals may be in
the program material , they are often extraneous, such as a dropped microphone. The stepdown equalization described in the Step-Down
Operation section provides the required protection. If step-down equalization is not used, the
Electro-Voice EX-24, XEQ-2 and XEQ-3 electronic crossover/equalizers can also provide
subpassband protection. The 3-dB-down points
are 30 Hz (EX-24 and XEQ-2) and 16 Hz or 32
Hz (XEQ-3).
Other high-pass filters are available, and onethird-octave equalizers can also be effective at
providing the required protection.
USE IN MULTIPLES
Cone loudspeakers may be stacked for greater
acoustic output and a narrower beamwidth. (It
is assumed that all cones are operating in
unison or in phase. )
At relatively low frequencies (below about 150
Hz for typical enclosures) stacking produces
additional acoustic output without altering dispersio'1. When a common signal is applied, a
6-dB increase in maximum acoustic output is
possible.
This increase occurs because the cones "mutually couple," acting as one cone with twice the
area (therefore , twice the efficiency) and twice
the power-handling capacity of a single cone.
This mutual coupling occurs when the frequency is such that the center-to-center distance between the two woofer manifolds is less
than about one-half wavelength.
MOUNTING
The DL 15W may be front- or rear-mounted
against either surface of its mounting flange
and requires a 353 mm (13.9 in.) diameter
cutout and a 371 mm (14.6 in.) bolt circle.
Normal fasteners up to 6 mm (1/4 in.) will fit
through the eight holes in the frame . Front
mounting is simplest using the optional SMH-1
speaker mounting kit.
ELECTRICAL CONNECTIONS
The DL 15W is fitted with a pair of plated, framemounted connectors with color-coded ends.
Electrical connection is made by pushing down,
inserting wire completely through the rectangular slot and releasing pressure. One conductor
of #9 stranded, #8 AWG solid, a pair of twisted
#15 AWG stranded or a pair of #14 AWG solid
conductors will fit.
AES RECOMMENDED PRACTICE
The DL 15W's specifications conform to the
"AES Recommended Practice for Specification
of Components Used in Professional Audio and
Sound Reinforcement" (AES2-1984/ANSI
S4.26-1984). This recommended practice was
developed over a number of years by consultants, manufacturers and government agencies
frorn around the world, so that the detailed
performance information required in professional applications could be provided in a unified format. The recommended practice has
been published in the October, 1984, issue of
the Journal of the Audio Engineering Society
(vol. 26, pp. 771-780). Individual copies of the
recommended practice are available from the
Audio Engineering Society, 60 East 42nd Street,
New York, New York 10165, USA. Also appearing in this issue is an article which comments on the recommended practice from an
engineering point of view (CA Henricksen,
"Engineering Justifications for Selected Portions of the AES Recommended Practice for
Specification of Loudspeaker Components,"
pp. 763-769). The comments in this article will
be particularly of interest to those not involved
in the day-to-day design and testing of loudspeakers.
ARCHITECTS' AND ENGINEERS'
SPECIFICATIONS
The low-frequency woofer shall have a nominal
diameter of 348 mm (15 in.), an overall depth of
165 mm (6.48 in.) and weigh less than 8.7 kg
(19.1 Ib). The frame shall be constructed of
strong, deformation-resistant die-cast aluminum. The magnet assembly shall incorporate
PROTEFTM protection, a TIRTM (Thermo Inductive Ring) and FDDTM (Flux Demodulation Device) to reduce inductive coupling and increase
power handling. The cone and dust dome should
withstand use in damp and humid conditions.
The voice coil shall have a diameter of 64 mm
(2.5 in.), a winding depth of 20.3mlTl (0.8 in.)
and be made of edge-wound aluminum ribbon.
The voice-coil former shall be made of aerospace-grade polyimide laminate and bonded
with high-temperature epoxy adhesives. The
performance specification of a representative
production unit shall be as follows: measured
sensitivity (SPL at 1 m (3.3 ft) with 1 watt input,
100- to 800-Hz pink noise) shall be in excess of
97 dB. The reference efficiency shall be at least
2.77%. The usable response shall be 40 to
2,800 Hz, and the nominal impedance shall be
8 ohms . The EIA rated power shall be 400
watts. The low-frequency transducer shall be
the Electro-Voice DL 15W.
UNIFORM LIMITED WARRANTY
Electro-Voice products are guaranteed against
malfunction due to defects in materials or workmanship for a specified period, as noted in the
individual product-line statement(s) below, orin
the individual product data sheet or owner's
manual, beginning with the date of original
purchase. If such malfunction occurs during the
specified period, the product will be repaired or
replaced (at our option) without charge. The
product will be returned to the customer prepaid. Exclusions and Limitations: The Limited
Warranty does not apply to: (a) exterior finish or
appearance; (b) certain specific items described
in the individual product-line statement(s) below, or in the individual product data sheet or
owner's manual; (c) malfunction resulting from
use or operation of the product other than as
specified in the product data sheet or owner's
manual; (d) malfunction resulting from misuse
or abuse of the product; or (e) malfunction
occurring at any time after repairs have been
made to the product by anyone other than
Electro-Voice or any of its authorized service
representatives. Obtaining Warranty Service:
To obtain warranty service, a customer must
deliver the product, prepaid, to Electro-Voice or
any of its authorized service representatives
together with proof of purchase of the product in
the form of a bill of sale or receipted invoice. A
list of authorized service representatives is
available from Electro-Voice at 600 Cecil Street,
Buchanan, MI 49107 (616/695-6831 or 800/
234-6831). Incidental and Consequential
Damages Excluded: Productrepairor replacement and return to the customer are the only
remedies provided to the customer. ElectroVoice shall not be liable for any incidental or
consequential damages including, without limitation, injury to persons or property or loss of
use. Some states do not allow the exclusion or
limitation of incidental or consequential damages so the above limitation or exclusion may
not apply to you. Other Rights: This warranty
gives you specific legal rights, and you may
also have other rights which vary from state to
state .
Electro-Voice Speakers and Speaker Systems are guaranteed against malfunction due
to defects in materials or workmanship for a
period of five (5) years from the date of original
purchase. The Limited Warranty does not apply
to burned voice coils or malfunctions such as
cone and/or coil damage resulting from improperly designed enclosures. Electro-Voice active
electronics associated with the speaker systems are guaranteed for three (3) years from
the date of original purchase. Additional details
are included in the Uniform Limited Warranty
statement.
Service and repair address for this product:
Electro-Voice, Inc., 600 Cecil Street, Buchanan,
Michigan 49107 (616/695-6831 or 800/2346831).
Specifications subject to change without notice.
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